Table 2. Diagnostic sensitivity, specificity, and positive and negative predictive values (cut off 17%, 95% CI) for serum samples from people with a diagnosis of Opisthorchis felineus infection confirmed by the detection of O. felineus eggs in their stool, serum samples from Opisthorchis sp. -free people, and serum samples from people suffering from other parasitic or non-parasitic infections.^a .

	Opisthorchis infection
ELISA result	Infected	n	Uninfected	n	Total
Positive	True positive	144	False positive	22	166
Negative	False negative	0	True negative	204	204
Total		144		226

^aSensitivity = 100% (95% CI: 97.45–100%), it was calculated as TP/(TP+FN); Specificity = 90.27% (95% CI: 85.63–93.80%), it was calculated as TN/(TN+FP);

^cPositive predictive value = 86.75% (95% CI: 80.62–91.50%), it was calculated as TP/(TP+FP); Negative predictive value = 100% (95% CI: 98.19–100%), it was calculated as TN/(TN+FN). TP, TN, FP, and FN are the numbers of true positives, true negatives, false positives, and false negatives, respectively.